JPS60197950A - 光学ヘツド - Google Patents

光学ヘツド

Info

Publication number
JPS60197950A
JPS60197950A JP59053524A JP5352484A JPS60197950A JP S60197950 A JPS60197950 A JP S60197950A JP 59053524 A JP59053524 A JP 59053524A JP 5352484 A JP5352484 A JP 5352484A JP S60197950 A JPS60197950 A JP S60197950A
Authority
JP
Japan
Prior art keywords
light
optical head
photodetector
recording
laser beam
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP59053524A
Other languages
English (en)
Japanese (ja)
Inventor
Hideo Ando
秀夫 安東
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Original Assignee
Toshiba Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toshiba Corp filed Critical Toshiba Corp
Priority to JP59053524A priority Critical patent/JPS60197950A/ja
Priority to US06/713,598 priority patent/US4694443A/en
Priority to DE19853510519 priority patent/DE3510519A1/de
Publication of JPS60197950A publication Critical patent/JPS60197950A/ja
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1381—Non-lens elements for altering the properties of the beam, e.g. knife edges, slits, filters or stops
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/0908—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for focusing only
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/0908—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for focusing only
    • G11B7/0916—Foucault or knife-edge methods

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Head (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Automatic Focus Adjustment (AREA)
JP59053524A 1984-03-22 1984-03-22 光学ヘツド Pending JPS60197950A (ja)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP59053524A JPS60197950A (ja) 1984-03-22 1984-03-22 光学ヘツド
US06/713,598 US4694443A (en) 1984-03-22 1985-03-19 Optical system for tracking an information recording medium
DE19853510519 DE3510519A1 (de) 1984-03-22 1985-03-22 Optisches system zum spur-abtasten eines informations-aufzeichnungstraegers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP59053524A JPS60197950A (ja) 1984-03-22 1984-03-22 光学ヘツド

Publications (1)

Publication Number Publication Date
JPS60197950A true JPS60197950A (ja) 1985-10-07

Family

ID=12945204

Family Applications (1)

Application Number Title Priority Date Filing Date
JP59053524A Pending JPS60197950A (ja) 1984-03-22 1984-03-22 光学ヘツド

Country Status (3)

Country Link
US (1) US4694443A (cs)
JP (1) JPS60197950A (cs)
DE (1) DE3510519A1 (cs)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5231621A (en) * 1986-09-05 1993-07-27 Canon Kabushiki Kaisha Focus detector which serves to split off a portion of a detected light beam only when the detected light beam is not refocused at an expected refocus point
US5060212A (en) * 1987-08-17 1991-10-22 Ricoh Company, Ltd. Integrated optical pick-up device
US5105410A (en) * 1987-12-28 1992-04-14 Ricoh Company, Ltd. Multi-beam optical pick-up
JP2692901B2 (ja) * 1988-10-31 1997-12-17 株式会社東芝 情報処理装置
US5105407A (en) * 1989-01-11 1992-04-14 Kabushiki Kaisha Toshiba Optical information-processing apparatus
US5251011A (en) * 1989-06-28 1993-10-05 Dainippon Screen Manufacturing Co., Ltd. Displacement detection system
US5281797A (en) * 1991-12-26 1994-01-25 Hitachi, Ltd. Short wavelength optical disk head having a changeable aperture
JP3402997B2 (ja) * 1997-03-12 2003-05-06 株式会社リコー 光ピックアップ装置
JP2001023190A (ja) * 1999-07-07 2001-01-26 Sony Corp 露光装置、露光方法、光ディスク装置、及び記録及び／又は再生方法
US8023368B2 (en) * 2003-10-16 2011-09-20 Panasonic Corporation Tilt sensor and optical disk drive

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AR205243A1 (es) * 1972-05-11 1976-04-21 Philips Nv Aparato para la lectura de un portador de grabacion reflector plano
FR2235448B1 (cs) * 1973-06-29 1976-05-07 Thomson Brandt
FR2325953A1 (fr) * 1975-09-29 1977-04-22 Thomson Brandt Senseur optique de focalisation et dispositif de focalisation comportant un tel senseur
JPS5266405A (en) * 1975-11-29 1977-06-01 Victor Co Of Japan Ltd Optical recording system of information recording discs
NL7706753A (nl) * 1977-03-23 1978-12-22 Philips Nv Inrichting voor het uitlezen van een optische stralingsreflekterende informatiedrager.
JPS54146613A (en) * 1978-05-10 1979-11-16 Hitachi Ltd Optical head
US4349901A (en) * 1980-06-20 1982-09-14 Eastman Kodak Company Apparatus and method for reading optical discs
JPS5752006A (en) * 1980-08-19 1982-03-27 Olympus Optical Co Ltd Method and device for detecting focus
JPS57108811A (en) * 1980-12-26 1982-07-07 Hitachi Ltd Optical focus position detector
US4466087A (en) * 1981-01-08 1984-08-14 Xerox Corporation Optical memory system for a reading/writing, verifying and tracking module
DE3280232D1 (de) * 1981-06-22 1990-09-27 Toshiba Kawasaki Kk Optischer kopf.
EP0070552B1 (en) * 1981-07-20 1990-06-27 Kabushiki Kaisha Toshiba Optical head
JPS5819744A (ja) * 1981-07-24 1983-02-04 Sony Corp 光学式記録再生装置
DE3280137D1 (de) * 1981-09-17 1990-04-19 Toshiba Kawasaki Kk Ein optischer kopf.
JPS5856236A (ja) * 1981-09-28 1983-04-02 Hitachi Ltd 光学的トラック位置検出装置およびそれを用いた光学的記録再生装置
JPS5968844A (ja) * 1982-10-14 1984-04-18 Matsushita Electric Ind Co Ltd 光学的可逆記録再生装置

Also Published As

Publication number Publication date
DE3510519A1 (de) 1985-09-26
US4694443A (en) 1987-09-15
DE3510519C2 (cs) 1990-12-13

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